Q1Multiple choice
Carbon exists in the atmosphere in the form of
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Correct option: C
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Worked solution
The answer is (c) carbon dioxide only
NCERT Exemplar · Class 10 · Science
Chapter 4: Carbon and Its Compounds
Practice each question, then open the answer or worked solution.
Multiple Choice Questions
17 questionsQ2Multiple choice
Which of the following statements are usually correct for carbon compounds? These
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
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Worked solution
The answer is (d) (ii) and (iv)
Explanation:
Carbon compounds form covalent bonds hence they have very weak force of attraction. Carbon compounds are poor conductors of electricity.
Q3Multiple choice
A molecule of ammonia (NH3 ) has
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Correct option: A
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Worked solution
The answer is (a) only single bonds
Explanation:
Nitrogen has three electrons in its outermost shell and hydrogen has 1. 3 hydrogen atoms combine with 1 nitrogen atom to make ammonia. These bonds are single bonds.
Q4Multiple choice
Buckminsterfullerene is an allotropic form of
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Correct option: C
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Worked solution
The answer is (c) carbon
Explanation:
Diamond, Graphite, Lonsdaleite, C60 (Buckminsterfullerene or buckyball), C540, C70, Amorphous carbon, and a single-walled carbon nanotube, or buckytube. Are the allotropes of Carbon.
Q5Multiple choice
Which of the following are correct structural isomers of butane?
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Correct option: C
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Worked solution
The answer is (c) (i) and (ii)
Explanation:
Chemical formula of Butane isC4H10, here option iii) and iv) have 8 hydrogen atoms, hence they are wrong.
Q6Multiple choice
CH3 – CH2 – OH Alkaline KMnO Heat 4 + → CH3 – COOH
In the above-given reaction, alkaline KMnO4 acts as
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Correct option: B
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Worked solution
The answer is (b) oxidising agent
Explanation:
Two Hydrogen atoms are replaced by an atom of oxygen making oxidation of ethanol. Here addition of oxygen is provided by potassium.
Q7Multiple choice
Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of
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Correct option: A
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Worked solution
The answer is (a) Addition reaction
Explanation:
Here Hydrogen is added to oil, hence it is an addition reaction.
Q8Multiple choice
In which of the following compounds, — OH is the functional group?
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Correct option: B
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Worked solution
The answer is (b) Butanol
Explanation:
Compound with OH Functional group will have a suffix ol in them hence answer is (b) Butanol.
Q9Multiple choice
The soap molecule has a
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Correct option: A
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Worked solution
Answer is (a) hydrophilic head and a hydrophobic tail
Explanation:
Because of hydrophobic tail Oil and grease is trapped inside a micelle. Hydrophobic head makes the outer surface of micelle. Hence micelle is easily washed by water.
Q10Written answer
Which of the following is the correct representation of the electron dot structure of nitrogen?
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Worked solution
The answer is d)
Explanation:
In this structure Nitrogen atoms get 8 electrons whereas in other options it is different.